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export default function Solution(    radius: number,    x_center: number,    y_center: number,) {    return {        randPoint(): number[] {            const r = Math.sqrt(Math.random()) * radius;
            const t = Math.random() * 2 * Math.PI;            return [x_center + r * Math.cos(t), y_center + r * Math.sin(t)];        },    };}